Mer contents (3)

I believe the answer is:

eau

'mer contents' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for eau that I've seen before include "Popular toilet water - . . . de Cologne" , "Water in France" , "Quick to notice things" , "-- de vie" , "French water from chateaux" .)

I've seen this clue in The New York Times.

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